Apparatus for molding hollow articles, for example, from artificial resins



1 Oct. 11, 1938. H H me 2,133,027

APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April 5, 1936 12 Sheets-Sheet l Fig. 1;

H. HCNIG APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April 3,' 1936 12 Sheets-Sheet 2 Oct. 11, 1 938. H Q 2,133,027 APPARATUS FOR MOLDING HOLLOW RTICLES, FOR EXAMPLE. FROM ARTIFICIAL RESINS Filed April 3, 1956' 12 Sheets-Sheet 3 Fig. 2.

Oct. 11, 1938.

I H. HONIG APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed Ap ril 3, 1936 12 Sheets-Sheet 4 Oct. 11, 1938. Q G 2,133,027

APPARATUS FOR MOLDING HOLLOW ARTICL E'S, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April s, 1936 12 sneets-shet 5 Fig. 3. 67 63 2 131 1 152 & 133

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ATTUP/Vf Oct. 11, 1938. H. HONIG 2,133,027 APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FIIOM ARTIFICIAL RESINS Filed April 5, 1956 12 Sheets-Sheet 6 Fig. 4,

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-//VV/V70l? HAG/ ATMIP/VEKI Oct. 11, 1938. H. HONIG APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April 3, 1936 12 Sheets-Sheet 7 III Oct. 11, 1938. v a s 2,133,027

APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April 3, 1936 12 Sheets-Sheet 8 Oct. 11, 1938. QM 2,133,027

APPARATUS FOR MOLDING 'HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April 5, 1956 l2 Sheets-Sheet 9 Oct. 11, 1938. HONIG 2,133,027

APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April 3, 195s 12 Sheets-Sheet 10 H; HC'NIG 2,133,027 APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Oct. 11, 1-93 12 Shets-Sheet 11 Filed April 3, 1938 A TTOK/VEK I H. HONIG APPARATUS FOR MOLDING HOLLOW ARTICLES, FOR EXAMPLE, FROM ARTIFICIAL RESINS Filed April 3, 1956 12 Sheets-Sheet l2 vew Patented Oct. 11, 1938 UNITED STATES arraaa'rus ma momma noLLow annoLas, ma EXAMPLE, mom ARTIFICIAL BESINS Heinrich Hlinig, Moa,'- ;m, casino:

to Richard Collins-andJohn both oi Dublin, Irish Free Morris Scher, London,

Joseph-Sheridan, State, and Philip England Appllcatlonjprll a, lass, Serial No. 72,040 In smear-1m April 10, m

1': Claims. Thepresent invention relates to improvements in or relating to apparatus for molding hollow articles under pressure from artificial resins which are moldable under the action of heat and pressure. The invention isparticularly but not exclusively applicable to apparatus for molding hollow articles having one or more constricted portions such for example as bottles and the like having a constricted neck portion. An apparatus for molding hollow articles from artificial resins according to the present invention comprises a movable support for one or more molds or mold cavities means for heating said one or more molds, or mold cavities and means 3 for blowing moldable composition on to the inner more molds or mold cavities walls of said one or by means of fluid under pressure.

The said movable support preferably carries mold cavities in which case means are provided to cooperate with said mold cavities to close them atone end, and thereby to form completedmolds.

Fluid admitted under pressure to the interior of the said mold or molds is employed not only for lining the interior of the molds with the artificial resin composition but also for supplying the necessary molding pressure. If desired, separate sources of fluidunder pressure maybe employed for lining themolds and for applying the molding pressure. In either case one or more common nozzles or thelike may be employed for supplying the moldable composition to the "interior of the mold of molds and for supplying the fluid under pressure for applying the molding pressure. These nozzles may be connected in turn to a source of low pressure fluid preferably air, for lining the molds and to fa source of high pressure fluid preferably air, for applying the molding pressure. Itis preferred however to employ merely a source of air under high pressure for both lining the molds and applying the necessary moldin Pr ssure. g i The. fluid under pressure preferably air for applying the molding pressure will be at a suitable pressure accordingto the resin employed and may for example be at a pressure of about 200 atmospheres.

, The apparatus also preferably comprises means for ejecting finished articles from molds, or mold cavities. I

If the apparatus is to be employed ass-am.

ing hollow articles having one or more constrictions, the mold or moldsmust befsepa'rable'. In j the case of articles having a singlev constriction,

such for example as bottle shaped articles having a narrow neck and an enlarged body portion the mold or;

(Cl. ll-5) the mold or each mold may be provided with a removable or separable base and the articles may be removed axiallyof the mold. In this case a suitable mold block may include a number of molds may be completed by heads'iltting and extending a certain distance into the body portions of the cavities. The said heads may be carried by a plunger adapted to move towards the moldblock and/or the mold block may be moved towards and into engagement with the heads to complete the molds. If desired of course a single mold, instead of a plurality in the block, may be constructed in a similarmanner.

The aforesaid nozzles may be carried with the mold or molds or mold cavities or alternatively the molds or mold cavities may be brought into operative relation with the nozzles at a suitable stage .in the operation of the machine. If the nozzles are movable with the molds, means are providedfor connecting them to a supply of fluid under pressure and witha supply of the molding composition for exampl a molding powder.

For charging a mold with the resin molding composition it is preferred to provide means for supplying a. preferably measured quantity of molding composition to a suitable chamber, cavity or conduit whiclrmay' be connected on theone hand to a source or fluid under pressure and on the other hand, to a nozzle or the like for charging the mold. The nozzles or the like are preferably provided with a large number of apertures directed towards the sides and base. oi the mold so as to direct the molding composition to the walls of the mold.

Incases where the nozzle or nozzles is/are carried with the one or more molds or mold cavities, thesaid filling chambers, cavities or the like are preferably also carried by the movable 'supportand maybe brought into registry with means for'supplying preferably definite or meassuitable conduits. Means are provided for closing the material inlet to each said filling chamber or the like in order to prevent escape of fluid under pressure therethrough. Where a plurality table may be rotated by any suitable means such for example as by a suitable hydraulic motor and means are preferably provided for rotating the table in steps or stages so as to bring the one or 1 more molds or mold cavities into successive positions for charging the molds and/or filling chambers, pressure molding, discharging the molded articles and if necessary, cleaning the molds or cavities. 'If desired two or more of these operations may be carried out at a single station, for example the operations of charging the molds and pressure melding.

Means are preferably provided for locking the table in the successive positions and such means may be associated vwith means for connecting the table, nozzles or the like carried by it with a source of fluid under pressure;

The mold or molds, mold blocks or the like may be mounted so as to be vertically slidable so that they can be pushed upwards or downwards into engagement with the charging and/or pressure nozzles and/or with closure heads for the molds. If desired, said nozzles and/or heads may be vertically movable.

The. nozzle or nozzles may enter the one or more molds or mold cavities from below and the articles ejected upwards or the nozzle or nozzles may enter from above in which case the articles may be ejected downwards or means may be provided for reversing the moid or molds or the like in which case the articles may again be ejected upwardly by suitableeiecting members which are caused to enter the molds. The finished articles may be removed by hand or automatically, if desired on to a suitable conveyor.

Means, preferably electrical, may be employed operating the various moving parts of the apparates and such means may be controlled by suitable valves which maybe automatically operated in desired sequence by any suitable means for example by cams or the like which may in turn be electrically driven. The supply of fluid under pressure may likewise be controlled automati cally.

If the apparatus be employed for molding articles which have external constrictions intermediate their ends, molds or mold cavities which are split and are separable laterally may be employed.

One convenient form of apparatus comprises a rotary table mounted for rotation in ahorizontal plane and a pluralityof mold assemblies carriedby said table in spaced relation one to another,

said mold assemblies each comprising a plurality of mold cavities open at the top, a perforated nozzle extending from .below into each mold cavity and each connectedto a separate filling chamber,

and a conduit having an inlet at the edge of the rotary table and having branches connected to the several filling chambers and thence to the nozzles. The assemblies are carried by the rotary table so as to be vertically movable therein. Arranged at suitable distances round the table are a station at which the filling chambers are charged, a station at which the material charged into the filling chambers is blown into the molds and molded under pressure to hollow articles and a station at which the finished articles are ejected from the molds. In this form of apparatus the mold cavities are open at the top. The charging station comprises means located above the table ior supplying a predetermined quantity of molding powder to each filling chamber. At the molding station a vertically movable plunger is disposed beneath the table adapted upon rising, to raise a mold assembly and to bring the open tops of the mold cavities into tight engagement with a plurality'of heads which form closures for the cavities to complete the molds. There is also a plunger which is movable into engagement with a recess in the side wall of the table to lock the table in fixed position. This plunger carries a nozzie adapted to make airtight engagement with the aforesaid inlet at the edge of the table. Above the table also is a'vertically movable plunger (or there may be more than one) carrying rods adapted to engage the upperpart of the assembly to separate the molel cavities from the heads at the conclusion of the molding operation. The mold cavities are surrounded by electrical heating units to which current is supplied and the said closure heads are also electrically heated. At the ejection station a vertically movable plunger is arranged below the table and thisplunger carries ejection rods adapted to engage a plate carrying ejection sleeves surrounding the perforated nozzles to raise said sleeves and eject finished articles upwardly from the mold cavities. The said piungers are operated hydraulically, and the rotary table is driven by an oscillating hydraulic motor having a one way drive connection th the table whereby the latter may be intermittently rotated.

Suppose that a mold assembly has just received its charge at the chargingstation. The table is rotated to bring the assembly to the molding station. At this instant a valve controlling movement of the hydraulic motor is closed to stop the table, whereupon a valve controlling the liquid supply to the molding plunger, the table locking piunger and the ejection plunger is opened causing these plungers to move. As the table is locked in position and the assembly is held in elevated position against the closure heads, an air valve is opened to blow the powder from the filling chambers to the molds. i'he powder adheres to the hot walls of the mold and flows to form a coating over the inner surface. A time switch'then operates to stop movement of all valve controlling parts preferably cams or the like and after a suitable time, the control mechanism is brought into operation again to permit the fluid to escape from behind the plungers whereby they return ta their original position. As this occurs, the hydraulic motor is reversed but does not carry the table with it. The'mold assemblies are lowered and the upper plunger is actuated to as sist lowering of the assembly from the closure heads. The'table is then further rotated when.

switch. Means may be provided for varying the working pressure and/or temperatures and/or timing employed to suit particular molding compositions. In order that the invention may be well understood a preferred embodiment will now be described by way of example only with reference to the accompanying drawings in which:-

Figure 1 is an elevation paratus in part section, 1

Figure 2 is a plan view of Figure Figure 3 is a section on the line A-B in Figure Figure 4 is a sectional box to enlarged scale, Y Figure 5 is a plan view of the bottom plate of the filling box, the air conduits'being shown by dotted lines,

Figure 6 is a, vertical'section through the water motor, taken along the line H.I of Figure 7,

elevation of the mold Figure '7 is a sectional plan taken on the line F-G of Figure 6, Figure 8 is a sectional plan taken on the line K-L of Figure 6,

Figure 9 is a sectional elevation of the table 5 locking unit,

Figure 10 is a vertical section on the line M-N of Figure 12 illustrating in detail a pair 01' piston valves, I

Figure 11 is a side elevationof the entire valve Figure 12 is a plan view of Figure 11, Figure 13 is an end elevation of Figure 11, and

Figure 14 is a general lay-out showing the pipe ing arrangements.

In Figure 1 the machine restson a bed plate I which forms part of the lower traverse 2, in which the main cylinder ated. Two columns 4 and 5 pass through holes 6, I, in the lower traverse is mounted on said column 5 and said table has three uniformly spaced radial slots l5 therein.

Figure 2 shows the table it with a complete mold box unit, I 6 in each of said slots IS. The positions marked in Figure 2 as positions C, D and'E will be referred to hereinafter as themolding position, the ejecting position and the filling'po sition respectively. In the ejecting'position' a girder ll carries a plunger l8 hydraulically operated in'a cylinder 36 and carrying a head IS on; which are mounted ejecting pins 20. A complete 1 molding unit comprises a mold box It and a filling box 2|, connected by pressure-tight connections 22. In the filling position there is a filling unit 2:. attached to the column s by a bracketHLfIn" the molding position the mold box It liesdirectly time. Just before the molding- The whole may be -controlled by valves operated by one orv more cam' shafts controlled in turn electrically by the time ofthe assembled apconduits ll, 59 are connected to the chambers 60,

and plunger 3 aresitu mung Pi 2 and are secured by nuts 8, 9. The columns rest on the lower traverse 2 on shoulders I0. Shoulders I I are provided at the upper end of said columns and the upper traverse l2 rests thereon. Nuts l3 secure said upper traverse against upward movement. A rotary table H mg unit can p filling unit "23 carried by thebraclret 24 is an outer-casing t: attachedto a block 04 through 3 above plunger headIfoi the plunger 3. In the molding'positicn the upper-traverse l2 are situated in casings 23 mounted on the upper-traverse I! by the members 34 and secured by the nuts II. The mold box (Fig. 5), connecting the conduits there being one of said chambers 60 below each the mold box unit It. a 7 It will be apparentthat three'complete moldbe mounted in the table ll, spaced from the r the filling position E the unit :1 lies directly above:

the illling'box 2 I, 'I'hefllling unit 23 consists of whichtwo slide plates, 68 passgthese slide plates extend outside the block. 64 at each side thereof passing through rectangular slots in said 1 block 04. The outer casing 83 carries twenty.-

which lie hoppers c1 tapering down in holes a pers 61 can pass into moving the slider 85 so that the,:holes I8 are over the conduits 69 material, contained in said hopsaid conduit 89 while the slide plate 88 remains covering the conduits I2.

The conduit 88 is made ofsuch dimensions that only the quantity of artificial resin composition or powder required for one bottle molding opera-.

'molding unit tion is passed therein for each movement of the slide plate 85. Furthermore when the slide plate 881s openedafter closing of the conduit 89 by means of the slide plate 85, only the requisite amount of powder or. the like will fall from the conduit '89 through conduit 12 and into the fliling pipes.5I registering with said conduits. This lies directly I trical heating element quantity of powder willthus fall as far as the bottom slide plate BI, which has holes 13 therein inregistry with the chambers 68, and which is movable to retain said powder or pass it to the chambers. 58. I

In the pressing position C the mold box unit I8 above: the plunger head 25 of the plunger 3. When the plunger which is hydraulically actuated, rises, the table 25 lifts the entire molding unit in the slot I until the, top of each of the molds head I4 secured in the die plate 26 by the nuts I5 and carrying between said nut and said die an electrical heating element I8.

In the ejection position D the mold box-unit I8 lies directly above the head I9 of the plunger I8.. The ejecting pins 28 are disposed on the head l9 so as to lie along the centre line of the mold box unit I8 and below the bottom plate 45 when the plunger is at its lowest position. The bottom plate 45 andthe nozzle plate 81 have holes therethrough disposed centrally of the nozzle members 4 I, so that when the plunger I8 rises the pins'28 pass and raise the ejector plate .44 and the ejecting sleeves 43, the ends'of which abut'against the neck 11 of the finished bottle I8. thereby pushing said bottles'upwards from the molds 31. The

mold box- I8 is restrained from vertical movement .in the ejecting position D by means of a bracketed arm 19, attached to the column 5 and by means of two nuts to a rod 88 mounted on the guides II. The bracket arm I9 is disposed centrally of the mold box I8 in the ejecting position D.

Each of the molds 31 is surrounded by an elec- 88' suitably insu ated, and these are connected mold plate 36. Slip rings 8I situated on the column 5, and insulated therefrom. pass current from any suitable source to brushes 82, there being one brush on eachof the three rings sup-.

pliedfor use with three phase current. Each of the brushes 82 is connected to. a rigid conductor 83 which terminates in a plug connection 84 situated on the table I4.- A corresponding plug connection conducts the current to the mold box unit It by means of a flexible cable 85 which is connected to the heating elements 88 by means ofa further plug connection 86.- It is to be understood that there will be a complete unit comprising three brushes, and rigid conductors to.

take the current to each of the three mold boxes It in the table I4. It will further be apparent that the brushesand slip rings allow of continuous heating of. the molds during rotation of the table, and that the flexible cables 85 permit of movement of the mold boxes to the pressa sirable to vary the temperature column 5' (Fig. 7).

81 is closed by a closure cut off after a rotation through the plates 45 and 39 together by leads in thethe'recess I I I.

I recess III.

terial employed for the molding, it will be deat which the molds are maintained. Furthermore it will be desirable to maintain the molds substantially at the selected temperature. For this purpose the bracket 81 attached to: the upper traverse I2 carries a thermostatic relay (showndiagrammatically in' Figure l) to maintain thetemperature of the molds substantially constant.

For rotation of the table I4 in order to move a from one position to the next, a water motor .88 is provided. The water motor 88 (Figs. 6, 7 and 8) comprises a casing 89 surrounding the column 5. The casing 89 is supported at its lower end on a ball race 98 and a sleeve 9| connected to the table I4 by bolts 92 runs on a ball race 93 situated at the upper end of the motor casing 89. The top and bottom of the motor casing are enclosed in a fluid tight manner by packings 94 sure rings 95 and 91. It will thus be apparent that a fluid chamber 98 is provided around the column 5. A fixed abutment 99 is seated in the A moving abutment I88 is secured to the casing 89 by the lug I8I. Fluid inlets I82, I03 are provided in the casing 89. Thus'when fluid is admitted by the inlet I02, the fluid pressure will act against the moving abutment I80 to rotate the casing 89 about the column 5. The casing ,89 carries three clutch members I84 disposed at intervals of 120 round the circumference thereof, these clutch members being urge'd'upwards by springs I05 into engagement with tapered recesses in the lower edge I06 of the sleeve 9|. The said recesses are so disposed as to cause sleeve 9I and the table I4 to rotate in such a manner that a mold box I6 will pass successively by the casing 89. The fluid supply at inlet I02 is of one third of a revolution. Fluid pressure is then supplied to the inlet I83 and the inlet I82 is connected to exhaust. The fluid pressure will now cause the casing 89 to rotate in a reverse direction through a third of a revolution, the clutch members I84 being gradually withdrawn from the, tapered recesses and re-engaging with these recesses after the return' rotation. Thus it will be seen that by suitable arrangement of fluid supply, to be described hereinafter, the table can through a third of a revolution and the motor casing 89 can then be reversed in readiness for the next rotation.

In order to lock the table at the appropriate position after each rotation, a locking unit I8'I is mounted on the column 4. This unit (Fig. 9)

comprises a pin I88 actuated by a hydraulically operated plunger I89 in a cylinder H0 and adapted to engage in a recess III (Fig. 1) in lugs II2, of which three are disposed on the table I4, at intervals of 120. The cylinder II8 has fluid inlets H3 and H4. The inlet H4 is attached to a sourceof constant fluid pressure whilst the supply to the inlet H3 is controlled as described hereinafter. Whenfiuid pressure is applied to the inlet 3 and acts on the surface II5, the force of the fluid on the smaller surface H8 is overcome and the pin I88 is moved forward into When the fluid supply to the inlet I I3 is cut off and the inlet is connected to exhaust the. constant pressure on the surface II8 will cause the pin I88 to be withdrawn from the Connected to the pin I08, so as to move thereand 95 and screwed presthe positions E, C, D, upon rotation of 8,188,087 with, is a pressure'fluid nozzle II1 which engages in a recess H3 in the lug II2, said recess II2 being provided with a packing ring to make a pressure tight connection. The nozzle I I1. is connected by a flexible supply pipe II3 to the source of pressure fluid for example air.. The recess H3 is connected by a conduit I20in the lug II2 to a flexible connection" I2I with a spring valve: I22.

situated therebetweem' The flexible connection I2I is connected in a pressure tight manner to the main conduit 51 in the plate 34 (Fig. 5). A rod I23 carried by the table 23 has a cam surface I24 adapted to openthe valve I22 when the table is raised. Upon lowering of the table 23 the valve will be spring closed. It will bell) parent that, at each of the three positions on the table I4 where a molding unit is; mounted, there will be a flexible'connection I2I and 'a valve I20 leading from the recess III to the main conduit 51.

It will be understood that eachmolding goes through a cycle of three operations namely filling, pressing and molding'and that these three operations are carried out on different molding units substantially simultaneously." I will now describe the operations performed on one unit (I6 and 2|) in one complete rotation of the table I4. An empty mold box I6 connec'tedto-a filling box 2| is rotated until the filling pipes 5i in'the said flllingbox lie directly below the conduits 12 in the block 64 (Fig. 3); The rotation of the table is then stopped and the table is locked in position by the unit I01 as above described.

Cylinders I25 and I26, connected to-the block 64 by rods I21 and a'strap member I23, aredisposed one above the other. Plungers I23 and I in saidcylinders are connected by boltsand'nuts at I3I, to the slide plates 63 and respectively. The cylinders I25 and I26 have two fluid inlets I 32, I33 and I34, I respectively. The inlets I32 and I35 are connected to a common conduit I36, and the inlets I33 and I34 are connected to a common conduit I31. Fluid pressure is appliedto the conduit, I31 thus admitting fluid to'the inlets I33 and I34, and causing the slide plate 65 (shown in the open position in Fig; 3) to open and the slide plate 66 to close 1 The artificial resin composition or powder in each of the hop pers 61 falls through the holes 63- into eachof the chambers 69 formed by the block 64 and the closed slide plate 66. The fluid supply to, the conduit I31 is then interrupted and the conduit is connected to exhaust, simultaneously fluid pressure is supplied to the conduit I36 thus applying fluid pressure at the inlets I32 and I35 and caus ing the plungers, I30 and I23 to open the slide plate 66 and close the slide plate. 66 respectively. a

The plunger I30 carries a cam member I33 having an oblique cam surface adapted to enga'ge with the oblique surface I 39 inthe member I43. The member I40 mounted on a shaft I is carried by a sleeve I42 mounted in a hole in the table I 4. A compression spring I43 abutting against a flange I44 on the said shaft I4I maintains the member I40 in an operative position but enables the member to be forced downward to allow subsequent rotation of the table to another position. At the lower end of saidshaft I4-I a member I45, having an oblique surface I46 oppositely arranged to said oblique surface I33, is mounted. The said surface I46 abutsagainst the oblique surface I41 on the abutment I43 attached to the slide plate 6|. thatwhen the plunger I30 opens the slide'plate 66 the slide plate BI is alsor-openedby means of It will thus be apparent the members I33, I33, I43, I, I43, I43, I41 and I43. I Thus when the slide plate 33 opensthe slide plate 3i. opens and the powder in the conduits 33 fallsthrough the holes 1I and 13 in the plates 33 and II into'the chambers 33. On the side of the plate. 34 remote from the abutment I43, two

1 bracketsi43 are mounted. These brackets carry 'rods I33 bearing springs III which bear against the'slideplate 3| and causeit to close the filling pipes 3I when the slide plate 33 is closed by the plunger: I33.- 1 a In this position therefore, a supply of molding composition sufiicient for the production of one bottle has been transferred from the hoppers 31 to each of the twenty chambers 33 in the plate 34. The table I4 is now rotated through a third of a rotationby the water motor 33, as above described, and is locked in position with the mold box lying'immediately above the table 23 on the plunger 3. It is to be understood that the spring retained member I43 will easily pass under the cylinder I23, with the member I43 sliding along the cover plate I32. Simultaneously with the locking of the tablea pressure tight connection is made at the recess III in the lugII2 as above described. .Fluid pressure is then applied to the main'cylinder to raise the plunger 3. The plunger in a pressure tight manner bythe heads 14. I

Simultaneously with the closing of the molds 31 the cam surface I24 on the member I23, carried by the table 23, operates the valve I22 and admits highly compressed air to the main conduit 31 in the bottom filling plate 34. The air entering the chambers 33. forces the powder or artificial resin composition contained therein along the conduits 62. The bottom plate 34 is, connected to the plate 43 of the mold box I3 by conduits I33, stuffing boxes I34 and packing glands I33 being provided at each end of said conduits to make pressure tight connection between the plates 34 and 45. A similar pressuretight connection is provided between'each of the twenty conduits 32 in the plate "and the twenty conduits 43 in the plate 43. Thepowder or the like in the chambers 60. is thus forced by the compressed air along the conduits-43 and up the nozzle members 4I, being sprayed onto the sides of the mold "through holes I33 in the nozzle member 4|. Suitable holes I53 are made in the end of the nozzle member 4I sofas to direct the powder over substantially the whole area of the mold. The molds 31- are, as above described, maintained .at a substantially constant temperature and the powder whensprayed through the holes I36 in the nozzle members becomes sumciently viscous to adhere to the sides of the mold 31, closed by the die member 14, and to form asubstantially uniform coating all over the surface of said mold. It will be apparentthat whenthe compresed air, for example at ,200 atmospheres pressure, enters the moved Elownwards by the plungers 3| and pass througl; holes in the die plate 26 and contact Iwith the top oijthe mold plate 36 thereby pushing the whole molding unit down to it; normal position, where'it is suspended in the table I4 by the lugs 41 contacting with tjne strips 48 running along the edges of the slot I5. By the lowering of the table 25 and the plunger 3 the valve I22 is spring elosed when the'cam surface I24 moves out of engagement therewith. i

Theitable I5 is now moved through another third-bf a rotation by the hydraulic motor 68, after the locking ,pin I08 and the pressure corinection member II1 have been withdrawn from table I6. i W

The table I! is then stopped'and locked by the unit I01 on the column 4 with another molding connection with the recesses iri the lug 1 I2 on the unit in the pressing position C and the mold box I6- cgntaining the pressed articles lies in the ejecti'pn position D. 'When the mold box hes above the ejecting cylinder 36, hydraulic pressure is applied thereto to raise the plunger I8 with its head I9 and theejecting pins thereon. The said pins 20 passing through holes arranged centrally of the plates 15 and 39 (Fig. 3), contact with the ejecting plate 44 causing the ejecting sleeves l3 (Fig. 4), carried thereby to eject the finished bottles 18 by pressing against the neck portions 11 {if the said bottles. The said bottles may be removed in anysuitable manner as' lfor example byghand, I'

It will beapparent that since three molding units (I6 arid 2I) are mounted in the table I4 one of the three operations of filling. pressing and ejecting will be performed on each of the molds substantially, simultaneously. The three molding units are then rotated to the next stage of operations, the whole apparatus thus being capable of continuous production. i

All the operations above described are preferably hydraulically operated, with the one exception that the actual pressing operation is performed by compressed air. For the; controlling of all the various operations acontrol unit I58 suitably mounted on Ia base I59 is provided. The control unit, shown in details in Figures 10 'to 13, comprisesfga composite valve box I60, camshafts I6] driven by an electric motor I62 through a suitable reduction gear I63. I

The composite valve box I consists of six valve units I64, one of saidunits being shown in section in Figure 10. Y I The unit I64 has a cang l65 having therein two valve chambers I66 and I61 and a connecting conduitl68. ;The chamber I66 is connected by the inlet I69 to a source of hydraulic power. The valve chamber I66 containing the valve I10 thus filled with water, upon lifting of the valve riod I1I, by means of a cam, water is passed through the connecting conduit 368 and through the valve chamber I61 and the utlet I12 to the cylinder or'the like to he actuated. when the operation of the said cylinder or the like is completed the valve I10 closes and the valve I13 opens to allow; the water from the operating cylinder: to passthrough the port I14 to exhaustthrougl'r' the exhaust outlet I15. When the valve j I13 closes, the valve I10 is opened and the water is again admitted to the operating cylinder. The

valve I13 consists of a main valt e containing subsidiary valve I16 to equalize the pressure on both sides of the main 'valv e I13. It will be understood that each of the six valve units I66 conv tains two valves, and that all the twelve valves are of similar construction to the valve I13 shown in Figure 10.

The composite valve box the units I66, the valve chambers I66 thereof being connected together by a conduit 111 so that water admitted by the inlet I69 (Fig. 12) will fill all of the vaive chambers I66, the remaining flve inlets being suitably plugged as at I18. A conduit i 19 connects all'the exhaust outlets I15 together so that the exhaust water can be disposed of rapidly.

. The valves in the said composite valve unit I60 are driven by cams on the two cam shafts I6! and I which are driven through gearing I8I by an electric motor I62, whichris controlled by a time switch I82 in a manner to be hereinafter described. The drive to said cam shafts is taken through a reduction gear I63. All of the cams operating the hydraulic supply valves are single lift cams. From the end of the cam shaft I6! a suitable drive I86 is taken toethe shaft I83 of .avalve 151 of any suitable kind, here shown diagrammatically as a rotary slide valve. The slide valve 151 consists of; a-circular slide I85 having on its inner face a substantially L shaped groove I86. Thesaid slide is held by a spring I81 in pressure tight sliding connection with the face I88 of the ported member, I89. The'mem- 1 her I89 has the inlet port I90 connectedto the source of compressed air, the port I9I connected to the pipe H9, and theexhaust port I92 connected to atmosphere. It will be apparent that by rotation of the slide .85, in a clockwise direction (Fig. 13)" the port I90 will be covered and the port I9i connectedtc the port 192 by means of the groove I86;

During" the molding operation the air pressure must be "maintained in the mold'31 fora short time for example about eight to twentyflve seconds. The motor I62 is therefore connected to a time switch I82 (shown diagrammatically in Fig. 1'), and after the molding unit has been raised by the head 25 and has been closed by the die members 14; the said time switch opens the current circuit to the motor I62 thereby stopping the motor and therefore the cam shafts I6I and I80, when the air inlet port I90 and the port I9I to the connection II9 are in connection with one another by means of the groove I85. when the pressure has been maintained in the mold for a suflieient time the time switeh I22 closes the motor circuit and the operation of the entire apparatus' proceeds. i

Figure 14 shows a general lay out of all the apparatus employed diagrammatically. I93 is a water pump which delivers water to an accumulator 694 the top of which is connected by a pipe I95 toa container I96 which is in connection with the air compressor I91. Thus the connection pipe I95 provides an air buffer in the water container I94. The air'container I96 is in direct connection withthe compressor at I98 and with the inlet port I90 in the valve I51 at I99.

A hydraulic intensifier 200 of known type per se is connected by cocks 20I, 202 to the main water pipe line 203. It will be apparent that the intensifier need only be included inf the circuit when a water pressure higher than that provided by the compressor is required. v

The main pipe line 203' conducts water at high pressure to the inletiI18 (Fig. 12) thus supplying each of the valves 204, 205, 206, 201, 208, 209 with water. The ports I12 of the valves 2| 0, 2I I, 2I2, 2I3, 2H, 2I5, are connected respectively to the upper cylinders 32, the conduit I36, the con- 7 I60 comprises six'of duit I31 (shown in Fig. 3), to the water motor inlet I02, the water motor inlet III, and the conduit m, the onnections being showndiagrammatically in Fig. 14. The conduit 2|! is'connected to the locking unit 36 and the main cylinder con the plunger 3. The inlet lilo! the locking unit I" is connected to the main supply line Ill by a conduit 2". All the exhaust ports gether by the conduit I I open-to exhaust.

Assuming now that the table I 4, three complete molding units (it and 2|),is stationary after a completed cycle of operations. The valve 201 is opened by its cam and admits water through the valve 2 II to the inlet III of the water and are all maintained motor 88, thereby causing the motor ll andthe table It to rotate through 120. The valve 2" is then closed by its cam and the motor ll stops. The valve 209 is then opened by its cam to admit water through the valve M to theconduit Ill and thus to operate the locking unit ill, the main cylinder containing the plunger 3 and the ejecting cylinder 36. Subsequently the air valve l5! admits airunder pressure to the conduit 9, this conduit being connected by the member I" and the recess H8 to the flexible connection IZI through the valve I22 opened by the cam member IN. Immediately the main air valve is opened, the time switch I82 opens the circuit of the motor 52 and thus stops the operation of the cam shaft l6! and Hill, the compressed air then completes the pressing operation in the molds 37.

Simultaneously with the opening of the valve 289, the valves 205 and 236 are operated by their cams and pass water through the valves 2 and 282 and the conduits I36 and ii! to operate the filling unit in the manner described above.

After the interval of time required for the completion of the pressure molding, the time switch I32 closes the motor circuit and thus puts the cam shafts IM and I8. into operation again.

As soon as rotation of the cam shafts recommences the air valve I 51 connects the port I SI to atmosphere through the port I 52. The valve 2% is operated. by itscams and admitswater through the Valve Zifl to the upper cylinders 32,

which cause the plungers 29 to press themoldbox down and simultaneously with the opening of the valve 204, the valve H5 is opened to exhaust by its cam and the plunger 3 is lowered together with the ejector plunger l8, and the locking unit comes out of engagement with the table I l in the manner previously described. Simultaneously with the above mentioned operation the valve 208 is opened by its cam and admits, water through the valve 2" to the motor inlet we, and the motor casing 89 is then rotated in a reverse direction in readiness for the next rotation,'when the casing has rotated so that the clutch members I04 recess the valve 208 is closed. The table M then rotates in the manner previously described. It will be understood that when the head 25 rises the mold block returns the plungers 29 raised position the valve 2"! having been opened to exhaust by its cam..

Whilst in the foregoing I have described a.

preferred form of apparatus according to this invention it isto be understood that various modifications may be made without departing from the scope thereof. fj

. I claim:'

-mold,

Ill, the ejecting cylinder I15 are connected toengage the next succeeding to their 1. Apparatus for molding hollow articles from artificial resins comprising a separable hollow means for heating said mold, means for blowing a molding powder against the inner walls 01' said fluid mold.

2. Apparatus for molding hollow articles from artificial resins comprising a plurality of mold assemblies, a plurality of receiving chambers therein, a charging station for supplying moldable composition to said receiving chambers, a molding station, means at said molding station to co-operate with said mold assemblies to form complete molds, means for admitting fluid under pressure through said receiving chambers to said complete molds, an ejecting station and means for passing said mold assemblies. to said stations in succession.

3. Apparatus for moldinghollow articles from artiflcial resins comprisinga plurality of separable molds, means for introducing fluid under pressure to the interior of said molds, means for introducing amoldable composition into the path to its entry into the molds, the molds and means for controlling said compositlon introducingmeans and under pressure to the inside 01' the lined said fluid introducing means to operate in sucmold to line the same and for applying connected to said nozzles, means for'supplying moldable composition to said conduits, means for supplying fluid under pressure to said conduits, means for moving said mold assemblies successively into operative relation with said composition supplying tion with said mold closing means, and said pressurefluid supply means. I

6. Apparatus for molding hollow articles from artificial resins comprising a plurality of mold .assemblies each comprising a plurality of molds open at one end, a plurality of nozzles extending respectively into said molds from theother ends, and Ya plurality of conduits connected respectively to said nozzles, a movable carrier for said assemblies, means for suplying moldable composition to said conduits, means for supplying fluid' under pressure to said conduits, means for closing themolds'of 'a mold asembly at their open ends, meansv for heating said molds, and means for moving said carrier to carry said mold assemmeans and into operative relablies into operativev positions .for charging the conduits, blowing the moldable composition from said conduits to the walls of the molds.

7. Apparatus for molding hollow articles'ir'om artificial resins comprising a separable hollow mold, a perforated nozzle extending into said mold,

a chamber connected tosaid nozzle, means'for supplyinga moldable composition to saidcham- I ber, meansior supplyingair under pressure to said chamber and thence to said mold, means for heating said moldand means forautomatically causing in sequence charging of said chamber, closing said mold, and supplying. of fluid under pressure ing moldable composition from said chambers to said molds, and common control means for said carrier moving means, said mold closing means, said composition supplying means and blowing means.

9. Apparatus for molding hollow articles from artificial resins, comprising a rotary carrier,-a plurality of mold assemblies carried by said carrier, a plurality of molds open at one end in said mold assemblies, a plurality of nozzles extending into said molds from their other ends, an ejector tube slidably mounted on each nozzle, a conduit connected to each nozzle, a filling chamber in. each conduit, a closable inlet for molding powder to each filling chambe means for supplying molding powder to said filling chamber when the mold assembly is inone position, means for closing the molds of a mold assembly when the assembly is in another position, means for supplying fluid under pressure through said chambers and conduits and nozzles'to the interior of said molds when the mold assembly is in said second position, means for heating the molds, means co-operating with said ejector tubes for ejecting molded articles when the mold assembly is in another position, the arrangement being such that three mold assemblies can be at the three respective positions at the same time, and means for intermittently rotating the carrier to bring the mold assemblies into successive operative positions.

10. Apparatus for molding hollow articles from artificial resins comprising a horizontally movable rotary carrier, means for intermittentlyrotating said carrier, means for locking said carrier in predetermined positions, means arranged above' said carrier for supplying moldable composition in definite quantities to a plurality of chambers carried by said carrier when the latter is locked in position, means connecting said chambers with the interior of said molds, means for closing said molds spaced from said supply means, means for suplying fluid under pressure through said chambers to said molds when the latter are closed, means for heating said molds and means for ejecting molded articles from said molds, spaced from said mold closing means.

11. Apparatus for molding hollow articles from artificial resins comprising a rotary carrier rotatable about a vertical axis, a plurality of mold assemblies slidably mounted for vertical movement in said carrier and equally spaced around said carrier, each mold assembly comprising a plurality of molds open at one end, a plurality of nozzles extending respectively into said molds from the other end, a plurality of filling chambers connected to said nozzles, and closure means for said chambers located above them, fluid inlet means carried by said rotary carrier corresponding in number and arrangement to the number of mold assemblies, a flexibleconnection between each fluid inlet means and the filling chambers of the respective mold assembly, means above said carrier ior supplying'moldable composition to a mold assembly when in position thereunder, a vertically movable plunger adjacent said carrier, a plurality'oi mold closure heads opposite said plunger for closing the molds of an assembly when the latter is moved by the plunger towards said heads, means for supplying fluid under pressure through said chambers and nozzles to the interior of said molds when the latter are closed, means for heating said molds, means for ejecting molded articles from said molds, means for intermittently rotating said carrier to bring said mold assemblies into successive operative-positions, and common control means for said carrier rotating means, said material supply means, said plunger, said fluid supply means andsaid ejecting means.

12. Apparatus for molding hollow articles from artificial resins comprising a rotary carrier, a plurality of mold assemblies carried by said carrier, each assembly comprising a plurality of molds, means for intermittently rotating said carrier, means for heating said molds, means for blowing moldable composition successively into the molds or each assembly so as to line them and for introducing fluid under pressure into the interior of the lined molds, means for opening the molds, means for ejecting the molded articles from the opened molds, and a time switch for controlling the time during which fluid under pressure is admitted to the interior of the heated molds.

13. Apparatus for molding hollow articles from artificial resins comprising a separable hollow mold, means for heating said mold, means for blowing a molding powder against the inner walls of said mold to line the same and for applying fluid under pressure to the inside of the lined mold, and means for controlling the time during which fluid under pressure is applied to the inside of the mold.

14. Apparatus for molding hollow articles from artificial resins including a rotary carrier, a plurality oi. molds carried by said carrier, a plurality of filling chambers carried by said carrier and connected respectively with said molds, a filling chamber charging station, a mold charging and pressure molding station, means at said lastnamed station for supplying fluid under pressure to the interior of said molds through said filling chamber, an article ejecting station, means for rotating said carrier intermittently to convey said molds successively to and past said stations, means for locking said carrier in position with said molds at said respective places, and common control means for said carrier rotating and locking means.

15. Apparatus for molding hollow articles from artificial resins comprising a separable mold, a perforated nozzle extending into said mold, a filling chamber, a conduit connecting said filling chamber to said nozzle, a hopper, a measuring chamber below said hopper, means for alternately admitting material from said hopper to said measuring chamber and discharging it therefrom into said filling chamber, means for heating said mold and means for supplying fluid under pressure to said'filling chamber and then to said mold.

16. Apparatus for molding hollow articles from artificial resins, comprising a rotary table, a plurality of mold blocks mounted in said table for vertical movement therein, each mold block comprising a plurality of molds open at one end, stationary closure means for said molds, means for moving said mold blocks in said table against said closure means to close said molds, means for 

